公开(公告)号：JPS62274086A

公开(公告)日：1987-11-28

申请号：JP11620886

申请日：1986-05-22

Applicant: TOSOH CORP

Inventor： MORI TAKASHI ,  DOI MASAHARU ,  FUKUDA KENICHI ,  KURANAI YASUHIRO

IPC: C25B3/00 ,  C25B9/00 ,  C25B9/08

Abstract: PURPOSE:To improve the durability of diaphragms in an electrolytic cell used to synthesize amino acid by an electrolytic ion substitution method and to develop an electrolytic anion substitution method by which superior efficiency is attained, by using F-contg. anion exchange membranes each having a specified structure as the diaphragms. CONSTITUTION:When amino acid is synthesized by an electrolytic anion substitution method using ion exchange membranes, an electrolytic cell 1 is divided into an anode chamber 6, an intermediate chamber 7 and a cathode chamber 8 with anion exchange membranes 2, 3, the anode 4 of Pt or the like and the cathode 5 of Fe or the like are placed in the anode and cathode chambers 6, 8, respectively, and hydrochloric acid and sodium hydroxide are fed to the anode and cathode chambers 6, 8, respectively. Electrolysis is then carried out at 50A/dm current density to obtain an amino acid soln. by the substitution of OH for Cl in the intermediate chamber 7. An F- contg. anion exchange membrane represented by formula I and having quat. ammonium groups represented by formula II or IV is used as the anion exchange membrane 2. An F-contg. anion exchange membrane represented by the formula I and having quat. ammonium groups represented by formula III is used as the anion exchange membrane 3.

公开(公告)号：JPS6347386A

公开(公告)日：1988-02-29

申请号：JP18953786

申请日：1986-08-14

Applicant: TOSOH CORP

Inventor： MORI TAKASHI ,  FUKUDA KENICHI ,  KURANAI YASUHIRO

IPC: C25B1/16 ,  B01J47/12 ,  C08J5/22 ,  C25B1/22 ,  C25B9/00 ,  C25B9/08 ,  C25B13/08

Abstract: PURPOSE:To efficiently separate acid and alkali at high concn. from an aq. salt soln. independently of the kind of salt by carrying out electrolysis with an anion exchange membrane contg. fluorine and made of a polymer represented by a specified general formula and a cation exchange membrane contg. fluorine. CONSTITUTION:An electrolytic cell is divided into chambers with an anion exchange membrane and a cation exchange membrane as diaphragms and an aq. salt soln. is fed to the middle chamber and electrolyzed to produce an aq. acid soln. in the anode chamber and an aq. alkali soln. in the cathode chamber. When acid and alkali are separated by electrolysis with the ion exchange membranes as mentioned above, a cation exchange membrane contg. fluorine is used as the cation exchange membrane and an anion exchange membrane contg. fluorine and made of a copolymer having repeating units represented by the general formula is used as the anion exchange membrane. In the formula, X is F or CF3, l is 0 or an integer of 1-5, m is 0 or 1, n is an integer of 1-5, each of p and q is a positive number, p/q=2-16, each of R1-R3 is lower alkyl, R4 is H or lower alkyl, Z(-) is a halogen anion and a is an integer of 2-10. Thus, restrictions on the kind of salt, electrolytic conditions, etc., can be eliminated.